From the reviews coming in for Dark Universe, it sounds like the land is feeling "too small" for some. Many in this thread have noted the demand for this theme/land probably exceeds the scale it was built.
I know that many people do not like jump scares, but for many others, jump scares are exactly what they want out of their "horror" entertainment. So one idea to relatively quickly add some incremental attraction capacity to Dark Universe (and the park in general) would be to add a walk-through experience in Dark Universe -- something on the scale of Disneyland's Sleeping Beauty Castle walk-through or the tunnels at Tom Sawyer's Island. This dark, claustrophobic walkthrough (into a mausoleum and through catacombs filled with mummified cadavers) could be tucked into the location highlighted here and include mechanical and sensory jump scares, satisfying that craving.